Adding Zesty and Hashicorp (#14944)

Author: Shoeler

data/events/2025/chicago/main.yml

@@ -201,6 +201,10 @@ sponsors:
     level: gold
   - id: postman
     level: gold
+  - id: zesty
+    level: gold
+  - id: hashicorp
+    level:gold
   - id: fairwinds
     level: bronze
   - id: lightrun